KEY: Incertitude, [See CERTAIN].

• Inform
• Informal, [See FORMAL]
• Information
• Infraction
• Infrangible, [See FRANGIBLE]
• Infrequency
• Infrigidation, [See INCANDESCENCE]
• Infringe
• Infuriate, [See INFLAME]
• Infuse
• Ingenious
• Ingenuous
• Inglorious
• Ingraft, [See GRAFT]
• Ingratiate
• Ingratitude, [See GRATITUDE]
• Ingredient
• Ingress, [See EGRESS]
• Ingurgitate, [See SWALLOW]
• Inhabile, [{See *ni and AWK}?]
• Inhabit
• Inhabitant
• Inhale
• Inharmonious, [See HARMONIOUS]
• Inherent